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| 1 | +'use client'; |
| 2 | + |
| 3 | +import { createContext, useEffect, useMemo, type ReactNode } from "react"; |
| 4 | +import { useLocalStorage } from "usehooks-ts"; |
| 5 | +import { LanguageModelInfo } from "./types"; |
| 6 | +import { getLanguageModelKey } from "./utils"; |
| 7 | + |
| 8 | +export interface SelectedLanguageModelContextValue { |
| 9 | + languageModels: LanguageModelInfo[]; |
| 10 | + selectedLanguageModel: LanguageModelInfo | undefined; |
| 11 | + setSelectedLanguageModel: (model: LanguageModelInfo | undefined) => void; |
| 12 | +} |
| 13 | + |
| 14 | +export const SelectedLanguageModelContext = createContext<SelectedLanguageModelContextValue | null>(null); |
| 15 | + |
| 16 | +interface LanguageModelProviderProps { |
| 17 | + languageModels: LanguageModelInfo[]; |
| 18 | + children: ReactNode; |
| 19 | +} |
| 20 | + |
| 21 | +// Single owner of the selected-language-model state. Mounted once (in the (app) |
| 22 | +// layout), so the selection lives in one place instead of being re-derived by a |
| 23 | +// `useSelectedLanguageModel` hook in every consumer. Previously each consumer |
| 24 | +// ran its own reset effect against the shared "selectedLanguageModel" |
| 25 | +// localStorage key, and because usehooks-ts broadcasts a storage event on every |
| 26 | +// write, those instances re-triggered each other into a rapid write loop when a |
| 27 | +// model was removed. |
| 28 | +export const LanguageModelProvider = ({ |
| 29 | + languageModels, |
| 30 | + children, |
| 31 | +}: LanguageModelProviderProps) => { |
| 32 | + const fallbackLanguageModel = languageModels.length > 0 ? languageModels[0] : undefined; |
| 33 | + const [selectedLanguageModel, setSelectedLanguageModel] = useLocalStorage<LanguageModelInfo | undefined>( |
| 34 | + "selectedLanguageModel", |
| 35 | + fallbackLanguageModel, |
| 36 | + { |
| 37 | + initializeWithValue: false, |
| 38 | + } |
| 39 | + ); |
| 40 | + |
| 41 | + // Handle the case where the selected language model is no longer available. |
| 42 | + // Reset to the fallback language model in this case. Only write when the |
| 43 | + // resolved selection actually differs (compared by key, since the stored |
| 44 | + // value is a fresh object reference on every read) — otherwise the effect |
| 45 | + // would re-write on every render. |
| 46 | + useEffect(() => { |
| 47 | + const selectedKey = selectedLanguageModel |
| 48 | + ? getLanguageModelKey(selectedLanguageModel) |
| 49 | + : undefined; |
| 50 | + |
| 51 | + const isSelectedModelAvailable = selectedKey !== undefined && languageModels.some( |
| 52 | + (model) => getLanguageModelKey(model) === selectedKey |
| 53 | + ); |
| 54 | + |
| 55 | + if (isSelectedModelAvailable) { |
| 56 | + return; |
| 57 | + } |
| 58 | + |
| 59 | + const fallbackKey = fallbackLanguageModel |
| 60 | + ? getLanguageModelKey(fallbackLanguageModel) |
| 61 | + : undefined; |
| 62 | + |
| 63 | + if (fallbackKey !== selectedKey) { |
| 64 | + setSelectedLanguageModel(fallbackLanguageModel); |
| 65 | + } |
| 66 | + }, [ |
| 67 | + fallbackLanguageModel, |
| 68 | + languageModels, |
| 69 | + selectedLanguageModel, |
| 70 | + setSelectedLanguageModel, |
| 71 | + ]); |
| 72 | + |
| 73 | + const value = useMemo<SelectedLanguageModelContextValue>(() => ({ |
| 74 | + languageModels, |
| 75 | + selectedLanguageModel, |
| 76 | + setSelectedLanguageModel, |
| 77 | + }), [languageModels, selectedLanguageModel, setSelectedLanguageModel]); |
| 78 | + |
| 79 | + return ( |
| 80 | + <SelectedLanguageModelContext.Provider value={value}> |
| 81 | + {children} |
| 82 | + </SelectedLanguageModelContext.Provider> |
| 83 | + ); |
| 84 | +}; |
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